Self-closing elevator-gate.



N0.698,385. Pate nted Apr. 22, I902.

G. E. ANDERSON.

SELF CLOSING ELEVATOR GATE.

(Application fild June 25, 1901.)

NITED STATES PATENT OEEIGE.

GUSTAVE E. ANDERSON, OF PHILADELPHIA, PENNSYLVANIA,ASSIGNOR OF ONE-HALF TO FAIRMOUNT MAOHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA. I

SELF -CLOSlNG ELEVATOR-GATE.

SPECIFICATION forming part of Letters Application filed June 25, 1901.

To all whom it may concern:

Be it known that I, GUsTAvE E. ANDERSON, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented 5 certain Improvements in Self-Closing Elevator-Gates, of which the following is a specification.

My invention relates to gates for use at the fioor'landings of elevator-shafts. I

The gate forming the subject of my. inven tion is arranged to be opened by hand when the elevator-car reaches any floor or landing, locking mechanism for the same being released by the car, such gate to be automatic I5 ally closed by thecar when the latter moves away from the floor or landing in either'direction. I

My invention is fully illustrated in the accompanying drawings, in which Figure 1 is a view of the improved gate forming the subject ofmyinvention, showing the same in the normally closed position with the locking mechanism in its operative position. Fig. 2 isa View of the gate showing it 2 5 in the raised position, the elevator-carhaving released the locking mechanism and permitting the upward movement of the gate by hand; and Fig. 3 is aside elevation of the elevator-car, showing also the gate operating and locking mechanism.

The gate 1 is carried by the endless chains 2, which are arranged at either side of the elevator-shaft, said chains being adapted to sprocket-wheels 3 and 4, suitably journaled 3 to uprights and arranged the proper distance apart. The gate may be secured to the chains. in any suitable manner, in the present instance special projecting links 5 being provided, as shown in the drawings, and the 0 movement of the gate is limited by the length of said chains.

In order to lock the gate in the lowered position, one" of, the sprocket-wheels 4 is provided with a ratchet-wheel 6, with which a 5 pawl 7 engages, controlled byaspringS. Nor} mally these parts are in engagement, and the gate is held locked in the lowered position, as shown in Fig. 1. In order to permit the upward movement of the gate, the elevator- Patent No. 698,385, dated April 22, 1902.

Serial No. 66,988. (No model.)

which when the pawl is in engagement with the ratchet-wheel projects into the path of a portion of the elevator-car. Carried by the elevator-car are the braces 11, having yokearms 12, which are so arranged as to embrace the chains, and when the car is moving toward any landing one armof jone ofsaid yokes will engage the cam projection 9 of the pawl and move said pawl out of engagement with its ratchet'wheel. Whenever the elevator-car stops at a landing, such locking mechanism being then released, the gate may be raised to the position shown in Fig. 2.

Each of the chains 2 carries projections 13, which are so disposed with relation to the gate when the latter isclosedthat they are respectively above and below the upper and lower sprocket-wheels 3 and 4, as shown in Fig. 1. When in this position, they are free from all danger of contact with the yokes 12. When the elevator-car is stopped,'however, and'the gate is raised, theseprojections are brought to the position shown in Fig. 2, the inner set being below the yoke-arms 12 and the outer set abovesaid yoke-arms, midway between the sprocket-wheels 3 and 4. Now if the car be moved in either direction one set of said projections will be engaged by the yokes 12, the chain will be moved, and the gate returned to its normal position. As soon as said yokes have passed the cam projection 9 the pawl 7 will fall into proper engagement with the ratchet-wheel 6, and the gate will be locked until the elevator'car again stopsat a landing. I

Although not shown in thedrawings,I prcfer to house the chains and the locking mechanism, so that'theycannot be tampered with from the floor-landin gs. Such housing, however, will necessarily be open toward the shaft.

Itwill be understood that each landing of the shaft through which the elevator car passes is provided with one of the gates hereinbefore described.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The combination of an elevator-gate, endless chains suitably mounted and supporting said gate, means for locking the gate, an elevator-car, means carried thereby for releasing the locking mechanism and permitting the raising of the gate by hand said means serving also to engage the chains and return the gate to the closed position as the elevator-car moves away from the floor or landing. I a

2. The combination of an elevator-gate,

endless chains suitably mounted and support-- ting said gate, means for locking said chains, projections carried by said chains, an elevator-car, and means carried by said car adapted to release the chain locking mechanism and to engage said projections whereby the chains may be moved to return the gate to its normal position as the elevator-car moves away from the floor or landing.

3. The combination of an elevator-car, a gate for a floor or landing, endless chains suitably mounted and supporting said gate, sprocket-wheels over which said chains pass, a ratchet-wheel carried by one of said sprocketwheels, a spring-controlled pawl in engagement with said ratchet-Wheel, and an'arm carried by the elevator-car and adapted to move said pawl out of engagement with the ratchetwheel, substantially as described.

4. The combination of an elevator-gate, endless chains suitably mounted and supporting said gate, sprocket-wheels over which said chains pass, a ratchet-wheel carried by one of said sprocket-wheels, a spring-controlled pawl in engagement with said ratchet- Wheel, an elevator-car, a cam projection car- 'ried by said pawl, and an arm carried by the chains, said yoke-arms being adjacent to the projections 011 the chains when-the gate is in the raised position, and adapted to engage one setof such projections when the elevatorcar moves away from a floor or landing in either direction.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

eUsrAvE ANDERSON \Vitnesses:

THos. S. BROWN, PARMENIO E. ANAYA. 

